CO₂레이저빔에 의한 이종재질 및 이종두께의 Tailored Blank 용접에 관한 연구

이경돈,유병길,김도훈,황창선 한국레이저가공학회 1999 한국레이저가공학회지 Vol.2 No.3

This research was conducted as a fundamental study to apply tailored blank welding technique into automotive production process. The materials used in this study were 2.0mm thickness low carbon steel sheets and 1.2mm Zn-coated low carbon steel sheets. To ensure the reproducibility and to consider various factors, experiments were conducted by applying Taguchi experimental method with 6 factors. Every welding process was repeated 3 times to offset the effect of uncontrolled factors. Elongation and LDH(Limited Dome Height) were measured to evaluate formability of specimens and Optical microscopy, XRD, SEM, and EDS analysis were performed to observe the microstructures and to determine the solidification mode in the weld. The elongation of specimen welded with optimum condition was 83% of base metal, and LDH was 84% of base metal. In case of laser treated specimen where Zn coating was removed, elongation was 85% of base metal, and LDH was 85% of base metal. In fusion zone, phases were consisted of quasi-polygonal ferrite, banitic ferrite, and martensite.

체육수업 설계에 대한 고등학생의 기대요구 분석

이정흔,오병돈,조민행,유영설,이명선,조병준 韓國學校保健學會 2009 韓國學校保健學會誌 Vol.22 No.2

Purpose: The purpose of this study was to analyze students' expectance demand towards high school physical education teaching. Methords : 392 participants randomly selected from one girls' middle school and one girl's high school in each of five tracts and then selected two classes from each of the schools. They were asked to respond to a simple Questionnaire about their views on the present physical education teaching. Results : Results showed that about one third of the participants would not choose physical education if the program were offered as an optional subject. Both male and female students ranked psychomotor domain as the top priority among the various learning objectives. Male students favored soccer and basketball while their counterparts liked badminton and volleyball. Over three-fourths of the participants suggested that students' opinions should be considered when teachers plan their program. Conclusion : The results of this study recommended that physical education teaching should be designed with considerations for professional values, societal changes as well as students' expectance on the design of physical education.

굴 養殖場 水域의 基礎生産 硏究

李秉暾,姜亨求,姜龍柱 동의대학교 기초과학연구소 1992 基礎科學硏究論文集 Vol.2 No.1

The primary production of phytoplankton in oyster farming bays were seasonally measured by ^14C method in Hansan-Koje Bay and Kamagyang Bay for one year period. In Hansan-Koje Bay, mean daily primary production was 0.52gC/㎡/day(0.22∼1.02gC/㎡/day), and it was relatively high in summer and low in winter. Annual primary production was estimated to be 189gC/㎡/yr. Mean chlorophyll α content was 1.70mg/㎥, and it was relatively high in summer. In Kamagyang Bay, mean daily primary production was 0.91gC/㎡/day(0.11∼3.61gC/㎡/day), and it was maximum in summer and minimum in fall. Annual primary production was estimated to be 334gC/㎡/yr. Mean chlorophyll α concentration was 2.34mg/㎥, and it was maximum in summer and relatively high in winter. Considering the water area of the two osyter farming bays, annual carbon production by phytoplankton were 9,450 ton in Hansan-Koje Bay and 37,000 ton in Kamagyang Bay. In general pattern of primary production in these bays, high production occurs in summer with increasing trend since spring.

꼬리줄나비고기, Chaetodon wiebeli의 초기발생

이치훈,김병호,노섬,이영돈 제주대학교 해양과환경연구소 2004 해양과환경연구소 연구논문집 Vol.28 No.2

The development of eggs and larvae of the butterflyfish. Chaetodon wiebili were observed. Fertilized eggs were spherical. colorless. and driven into gelatinous masses. They measured 0.75±0.18 in diameter and not contain an oil globule. Hatching taken place 61.0 hours after two celled stage at water temperature 25.6-27.7℃. Newly hatched larvae measured 0.91 nm in total length and had an ovoid yolk of 0.65 nm in longest diameter. In 72 hours after hatching. the larvae grew 1.72 nm in total length. The mouth and anus were open and the melanophore pigments appeared above the eyes. The pectoral fins are formed and the larvae began to swim actively.

소아 만성 부비동염에서 단순촬영상과 OMU CT상의 비교

이병돈,박상호,김장묵,이승균,장혁순,강주원,김장욱 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.1

Most commonly and widely used diagnostic tool for chronic paranasal sinusitis in children is plain X-ray check not only because of small radiation dose and easy performance, but because of low cost. However ostiomeatal unit computed tomography(OMU CT) was known to be more accurate and recommended recently by many physicians. The author have studied for both OMU CT and plain X-ray of paranasal sinuses and compaird their findings in 90 chidren(180 sides of sinus) aged from 4 to 14 years who suspected having sinusitis. OMU CT was taken after plain X-ray examination (Caldwell's view, water's view, lateral view), and the time interval betweeen these two examination was O to 14 days (average 4.7 days). The following results were obtained. Considering that OMU CT was accurate, the rate of correspondence in diagnosis of sinus pathology between plain X-ray and OMU CT was 48.3% in the ethmoid sinus, 51.1% in the maxillary sinus, 41.9% in the sphenoid sinus, 43.4% in the frontal sinus. If all OMU CT findings had been accurate, the incidence of false positives according to plain X-ray was 25.5% in the ethmoid sinus, 28.3% in the maxillary sinus, 70.8% in the spenoid sinus and 77.8% in the frontal sinus. While, the incidence of false negatives according to plain X-ray was 85.9% in the ethmoid sinus, 70.5% in the maxillary sinus, 50.0% in sphenoid sinus and 37.5% in the frontal sinus. A routine preoperative OMU CT is recommended, which allows a detailed evaluation of pathologic changes and anatomical relations of the paranasal sinuses before surgical interventiaon for the paranasal sinuses. Considering the above facts, diagnosis of pediatric sinusitis only by plain X-ray was inadequate and OMU CT was necessary.

진균성 부비동염의 임상적 고찰

이승원,김장욱,박영진,송태현,이병돈,장혁순 순천향의학연구소;Soonchunhyang Medical Research Institute 2000 Journal of Soonchunhyang Medical Science Vol.6 No.1

The fungal sinusitis is relatively rare and mainly develops in immunocompromised hosts, but is sporadically appears in the immunocompetent patients, where its incidence tends to be increasing. Because the clinical features of this disease are similar to those of chronic suppurative sinusitis, this entity may be overlooked. We analysed thirteen fungal sinusitis from January 1997 through December 1999 based on clinical features, laboratory characteristics and operative findings. The results are as follows. 1)Fungal sinusitis occurred 3.3 times as frequently in female patients as in male patients and the peak age groups are 4th and 5th decades. 2) The time intervals between the onset of symptoms and the first hospital visit were as follows: 5 cases within 3 months, 1 case between 4 and 6 months, 3 cases between 7 and 12 months, and 4 cases over 1 year. 3) The chief complaints were nasal obstruction, postnasal drip, rhinorrhea, cheek pain, headache, ocular pain, sneezing. 4) The characteristic computerized tomographic findings were hyperattenuated lesions in the maxillary sinus and in the nasal cavity near the natural ostium. 5) The most common pathogen was Aspergillus(92.3%) 6) We performed Caldwell-Luc's operation only in 4 cases, Caldwell-Luc's operation with intranasal ethmoidectomy in 3 cases, Caldwell-Luc's operation with endoscopic sinus surgery in 3 cases and endoscopic sinus sugery only in 3 cases. 7) Most of the gross specimens revealed a fungus ball containing a black-brown necrotic debris or caseous material.

이개에 발생한 혈관평활근종 1례

이병돈,김동욱 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Angioleiomyoma is a benign tumor of smooth muscle origin arising from the muscularis layer of blood vessel walls. The tumor a form of subcutaneous vascular leiomyoma that usually occurs in the extremities. They are usually located at the lower extremities and rarely located at head and neck region. Although angioleiomyoma has been described in the head and neck region, it extremely rarely occurs in the auricle. The tumors are usually small(2 to 15mm). round, firm, skin-colored, and encapsulated. The incidence in female is higher than male, a ratio of 1.7 to 1.0. The diagnosis is angioleiomyoma via histology. The treatment of angioleiomyoma is complete surgical excision and recurrence after excision is rare. Recently we experienced a case of angioleiomyoma of the auricle. So the case will be discussed with literature review.

용접공들의 면역능에 관한 연구

이수일,조봉수,김영욱,고광욱,조원근,김영실,강수용,황인경,조병만,김돈균 大韓産業醫學會 1997 대한직업환경의학회지 Vol.9 No.1

The authors examined human immunity indicators such as CD4, CD8, Natural Killer(NK) cell, IgG, IgA, and IgM, and heavy metals such as Pb, Cr, Cd to evaluate the health hazard of welders. We selected total 126 male subjects, 60 welders who had more than 5 year working history as an exposure group, and 66 office workers and medical college students as a control group. This immunity evaluation approach is the first newly designed study that has never been tried in past studies on welder's heath evaluation. And the results were as follows. 1. Total lymphocyte count of peripheral blood was significantly higher in welder group, 2,615±650 ea/㎕ compared with 2,368±681 ea/㎕ in control group(p>0.05). 2. The proportion of CD4, CD8, NK cell in welder group was 37.5±9.4%, 24.0±8.8%, and 21.0±9.5%, respectively, and 35.5±6.5%, 25.0±6.9%, and 19.6±8.8% in control group. CD4 and NK cell were slightly higher, and CD8 was slightly lower in welder group. but there was no statistical significance between two groups(p≥0.05). 3. IgG, IgA, and IgM in welder group were 15.9㎎/㎗, 2.7㎎/㎗ and 1.5㎎/㎗, respectively, and 15.6㎎/㎗, 2.9㎎/㎗ and 1.7㎎/㎗ in control group. There was no statistical significance between two groups(p≥0.05). 4. Blood lead, cadmium and chromium concentrations were 4.2±1.8㎍/㎗, 0.4±0.38㎍/㎗, 1.2±0.6㎍/㎗ in welder group and 3.2±1.7㎍/㎗, 0.44±0.29㎍/㎗, 1.1±0.6㎍/㎗ in control group, respectively, and these value were within normal ranges.

多層薄膜型 ZnS : Mn電場發光素子에 관한 硏究 Mn Thin Film Electroluminescence and it's Characteristics

李相潤,羅炳旭,孫相豪,李相敦 慶北大學校 1986 論文集 Vol.42 No.-

The devices have an ITO-Y_2O_3-ZnS : Mn-Y_2O_3-Al structure with Y_2O_3 double insulating layers. The dependence of the emission characteristics and crystallinity of ZnS : Mn upon the fabrication parameters such as the Mn concentrations and substrate temperatures during the evaporation has been investigated. The highest brightness with 30fL at frequency of 1KHz and a pulse height of 200V was obtained. And then the peak of spectrun of PL and EL are 5850Å.

구개편도에 발생한 결핵

이병돈,강주원,장혁순,박철규,김장묵 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.1

Tonsillar tuberculosis, almost always secondary to pulmonary tuberculosis is very rare disease in otolaryngologic fields. Authors have experienced a case of tonsillar tuberculosis associated with miliary pulmonary tuberculosis. The patient had cough, sputum and sore throat for 1 month. On physical examinations, palatine tonsils were slightly hypertrophied, smoothly surfaced, but crypt ulceration or patches were not seen. Diffuse discrete nodules were seen in both lung fields by simple chest X-ray. In high resolution computed tomography, miliary tuberculosis was suspected and in pleural needle biopsy, granulomatous inflammaiton was diagnosed as tuberculosis. AFB smear of sputum was two positive. Histopatholoigic finding of right tonsil was consistent with tuberculosis. He was cured of it with antituberculosis medications for one year. We report the case with review of the literatures.